#define _CRT_SECURE_NO_WARNINGS 1

#include"Date.h"

Date::Date(int year, int month, int day )
{
	_year = year;
	_month = month;
	_day = day;
}

Date::~Date()
{
	_year = 0;
	_month = 0;
	_day = 0;
}

void Date::print()const
{
	cout << _year << "-" << _month << "-" << _day << endl;
}

Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

Date& Date::operator=(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;

	return *this;
}

Date& Date::operator+=(int day)
{
	if (day < 0)
	{
		return *this -= -day;
	}

	_day += day;

	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month > 12)
		{
			_month = 1;
			_year++;
		}
	}

	return *this;
}

Date Date::operator+(int day)
{
	Date temp(*this);
	temp += day;

	return temp;
}

Date& Date::operator-=(int day)
{
	if (day < 0)
	{
		return *this += -day;
	}

	_day -= day;
	while (_day <= 0)
	{
		_month--;
		if (_month == 0)
		{
			_month = 12;
			_year--;
		}
		_day += GetMonthDay(_year, _month);
	}

	return *this;
}

Date Date::operator-(int day)
{
	Date temp = *this;
	temp -= day;

	return temp;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date temp = *this;
	*this += 1;
	return temp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date temp = *this;
	*this -= 1;
	return temp;
}

bool Date::operator>(const Date& d)
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month > d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			return _day > d._day;
		}
	}
	return false;
}

bool Date::operator==(const Date& d)
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}

bool Date::operator >= (const Date& d)
{
	return *this > d || *this == d;
}

bool Date::operator < (const Date& d)
{
	return !(*this >= d);
}

bool Date::operator <= (const Date& d)
{
	return !(*this > d);
}

bool Date::operator != (const Date& d)
{
	return !(*this == d);
}

int Date::operator-(const Date& d)
{
	Date max = *this;
	Date min = d;
	int flag = 1;
	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}

	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}

	return n * flag;
}
